期刊
INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY
卷 63, 期 -, 页码 144-151出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ibmb.2015.06.009
关键词
BmFAF; Negative regulation; Relish; Proteasomal degradation; Bombyx mori
资金
- National Basic Research Program of China [2012CB114600]
- Natural Science Foundation of China [31201854]
- Chongqing Municipality [CSTC2014JCYJA80010]
Negative regulation is required to keep NF-kappa B-dependent immune response under tight control. In previous study, we have identified a Fas associated factor (FAF) family member in Bombyx mori, BmFAF, and proposed it may act as a negative regulator in immune response. In this study, we found knock-down of BmFAF by RNAi led to a remarkable increase in transcriptional level of several antimicrobial peptide genes, including BmCecropinA1 and BmMoricin, and higher survival rate to Gram-negative bacterial infection. We also confirmed the regulatory role of BmFAF in suppressing NF-kappa B-dependent transcription by employing an inducible promoter in BmE cells. Consistent with these physiological phenotypes, BmFAF suppressed the activity of the essential transcription factor, Relish, in IMD signaling pathway by promoting its proteasomal degradation through direct interaction. In addition, by constructing various truncation mutants, we further demonstrated that UBA domain in BmFAF is required for the inhibitory role, and potential ubiquitination also occurs in this domain. Taken together, our results suggest that BmFAF is a negative regulator of IMD pathway by mediating degradation of Relish. (C) 2015 Elsevier Ltd. All rights reserved.
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